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Shiavault - a Vault of Shia Islamic Books Mikyalul Makarim Fee Fawaaid ad-Duaa Lil Qai’m vol. 2 34: Renewal Of Oath At The Hands Of Imam (aj) Every Day - Every Friday One of the duties during Ghaibat is to renew the oath of fealty with Imam (aj). This can be accomplished after every obligatory prayer, or on Friday. There are two aspects of this discussion. (1) In the meaning of Bayyat (oath) (2) The command of Bayat.
Discussion One: Meaning of Bayat Bayat means that a person gives oath of fealty to a person in all sincerity and with loyalty. That is, he shall help with his property and life one to whom he has given the oath. And in helping him he shall not be deficient in anything related to this oath.[^1] It this like the oath mentioned in Dua Ahad. There is special emphasis to recite it in the morning for forty days regularly.
Also, the Messenger of Allah (S) has commanded his nation to pay allegiance to the Purified Imams (as). And there is no difference between the presence or absence (Ghaibat) of Imam (as). This type of allegiance is a necessary requirement of Eimaan. Rather, you cannot imagine faith without allegiance. Thus the seller here, is the believer and the purchaser is the Almighty Allah.
Therefore whoever breaks (his faith), he breaks it only to the injury of his own soul, and whoever fulfills what he has covenanted with Allah, He will grant him a mighty reward.